If it's the one I'm thinking of, you need the Ball and Chain and you can get up to the second floor, the use the Ball and Chain to move the platforms suspended from the ceiling to reach it. Hope that helped
If you go to the room right above it (I think it's the room with a canon), you see a piece of floor that looks different from the rest. Bomb it or throw that chain ball against it. You should drop right in the room where the heart piece is. I don't know for sure if that's the one you're talking about though.